/Engine/Source/Runtime/Slate/Public/Framework/Text/ShapedTextCache.h
Try and find an existing shaped text instance, or add a new entry to the cache if one cannot be found
The shaped text instance
FShapedGlyphSequenceRef FindOrAddShapedText ( const [FCachedShapedTextKey](API\Runtime\Slate\Framework\Text\FCachedShapedTextKey) & InKey, const TCHAR * InText )